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Old 02-12-2012, 07:00 PM
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Exclamation weird cooling system pressure? help please

i have a 2004 6.0 and it has been doing some weird stuff lately. the truck runs great and all temperatures look perfect. im using an edge cts to monitor them. my oil temp is at 188 and my coolant temp is usually at 186-188. the truck currently has an sinister egr delete so that elimates any possibilities of the problem coming from there. after i drive the truck i get out and pop the hood and squeeze the upper radiator house it is really firm, if i really hammer on the truck it will be rock hard but the truck will not puke coolant and im not losing any coolant. no loss of power or white smoke. i dont know what it could be. any ideas? any help would be awesome.
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Old 02-12-2012, 07:51 PM
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I don't know how to tell ya this but it is supposed to be hard the system is under pressure.
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Old 02-12-2012, 07:56 PM
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You need to hook up a pressure guage to your coolant system then. It's a possibility your hg are going just not enough to push it past 16 psi and puke


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Old 02-12-2012, 08:05 PM
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The system is designed to hold up to 16psi.... 16lbs/square inch..
Think of it this way, you're finger is about 1square inch. You are squeezing it with 2 fingers.....
To get it to move much will require a rough estimate of 32lbs of pressure + the resistance of the coolant tube..

So, unless it's puking or making a tea kettle sound and whistling at you while WOT. You are fine.
But you can always hook up a gauge to it and find out what your pressures are.
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Old 02-12-2012, 08:08 PM
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well by recently i mean like the past month or so. if it was head gaskets i would have thought it would have gotten worse over time? also no other symptoms of head gaskets. temps are good, no smoke and no lose of coolant. im starting to think my headbolts are slightly stretched causing the heds to lift only under a hard acceleration? does that make sense?
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Old 02-12-2012, 08:09 PM
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also ive felt the radiator hose on two of my buddies 6.0's one an 05 and the other an 06 and both are softer than mine by a considerable amount
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Old 02-12-2012, 08:16 PM
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I don't think "feeling my hose compared to my buddies hose" is a proper mechanical diagnosis of an issue....

Take that in anyway you want..... hahahahahaha
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Old 02-12-2012, 08:18 PM
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hahahaha yea that doesnt sound too good but on a serious note i dont know what to do about the truck
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Old 02-12-2012, 08:21 PM
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Exactly what's been said.
Either a) hook up a gauge and actually diagnose a problem b) don't worry about it since it's not leaking.

You say weird stuff lately. You're only "issue" is that your coolant hoses are firmer than your friends..
I don't see the issue here.
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Old 02-12-2012, 08:36 PM
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ok i will try to pick up a gauge set up tomorrow, does what i said about the heads possibly lifting make any sense? im only running a superchips if that helps
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